Error code E-91 means the waste ink counter is full. It had to be resetted in order to fix the problem.
For some Epson printers, the software SSC Utility can reset the counter.
Epson Artisan series Artisan 700, Artisan 725, Artisan 800, Artisan 835, Artisan 837, EP-901A
Epson B and BX series B1100, B1110, B300, B300DN, B310, B310N, B40W, B42WD, B500DN, B510, B510DN, B510N, B518DN, BX300F, BX305FW, BX310FN, BX525WD, BX600FW, BX610FW, BX620FWD, BX625FWD
Epson Stylus C series C20, C40, C41, C42, C43, C44, C45, C46, C58, C59, C63, C64, C67, C68, C70, C76, C77, C78, C79, C80, C82, C83, C86, C87, C88, C90, C92, C93, C94, C95, C97, C98, C99, C110, C120, C480, C560, C660, C670, C680, C777, C880, C888
Epson Stylus CX series CX1390, CX1500 ,CX1600, CX2800, CX2900, CX3100, CX3200, CX3300, CX3400, CX3500, CX3600, CX3650, CX3700, CX3800, CX3805, CX3810, CX3900, CX4000, CX4100, CX4200, CX4500, CX4600, CX4700, CX4800, CX4850, CX4900, CX5100, CX5400, CX5500, CX5505, CX5700, CX5900, CX6300, CX6400, CX6500, CX6600, CX6900, CX6900F, CX7300, CX7400, CX7450, CX8300, CX8400, CX8450, CX9300F, CX9400F, CX9500F
Epson Stylus D series D68, D82, D88, D92, D120
Epson Stylus DX series DX3800, DX3850, DX4000, DX4050, DX4200, DX4250, DX4400, DX4450, DX4800, DX4850, DX5000, DX5050, DX6000, DX6050, DX7300, DX7400, DX7450, DX8400, DX8450
Epson Stylus EP series EP-801A, EP-803A, EP-901A, EP903A
Epson Stylus K and L series K100, K200, K300, L100, L200, L300 Epson ME Office Series ME2, ME20, ME30, ME32, ME-B40W, ME70, ME80W, ME82WD, ME200, ME300, ME320, ME340, ME360, ME510, ME520, ME530, ME535, ME560, ME570, ME600F, ME620F, ME650N, ME650N, ME900WD, ME960FWD, ME1100
Epson NX Series (See TX Series) NX100, NX110, NX111, NX125, NX127, NX200, NX205, NX210, NX215, NX220, NX300, NX305, NX310, NX315, NX400, NX405, NX410, NX415, NX420, NX430, NX510, NX515, NX620
Epson PictureMate (PM) Series PM100, PM210, PM215, PM225, PM235, PM240, PM250, PM260, PM270, PM280, PM290, PM310, PM500, PM-A820, PM-A890, PM930C, PM-A950, PM-A970, PM970C, PM-G800, PM-G820, PM-D800, PM-3500C, PM,G4500, PM-G5000
Epson PX series PX600W, PX600FW, PX640, PX650, PX659, PX660, PX700W, PX700W, PX720WD, PX800FW, PX800FWD
Epson R series R200, R210, R220, R230, R240, R245, R250, R260, R265, R270, R275, R280, R285, R290, R295, R300, R310, R340, R350, R360, R365, R380, R390, R395, R520, R800, R1380, R1390, R1400, R1800, R1900, R2400, R2800, R3880, R4880, R7880
Epson RX series RX420, RX425, RX430, RX500, RX510, RX520, RX530, RX560, RX565, RX580, RX585, RX590, RX595, RX600, RX610, RX615, RX620, RX625, RX630, RX640, RX650, RX680, RX685, RX690, RX700 297
Epson S series S20, S21, S22
Epson Stylus Photo series: P50, P60, 870, 890, 1270, 1290, 1390, 1400, 1410, 1420, 2000P, 2100, R7880
Epson Stylus Pro Stylus Pro 7000, Stylus Pro 9000, Stylus Pro 9600
Epson Stylus SX series SX100, SX105, SX106, SX110, SX111, SX115, SX117, SX125, SX130, SX200, SX205, SX210, SX215, SX218, SX230, SX235, SX400, SX405, SX410, SX415, SX420W, SX425W, SX430W, SX435W, SX510W, SX515W, SX525WD, SX550W, SX600FW, SX610FW SX620FW
Epson T Series T10, T11, T13, T20, T20E, T21, T22, T23, T24, T25, T26, T27, T30, T31, T33, T40W, T42W, T42WD, T50, T59, T60, T80W, T1100, T1110
Epson TX series TX100, TX101, TX102, TX103, TX105, TX106, TX109, TX110, TX111, TX115, TX116, TX117, TX119, TX120, TX121, TX125, TX135, TX200, TX205, TX209, TX210, TX219, TX220, TX230, TX235, TX300F, TX320F, TX400, TX405, TX408, TX409, TX410, TX415, TX419, TX420, TX420W, TX510FN, TX550W, TX560WD, TX600F, TX600FW, TX600W, TX610FW, TX620FWD, TX640, TX650, TX659, TX660, TX700W, TX700FW, TX720WD, TX800W, TX800FW, TX820FWD
Epson WorkForce series 30, 40, 42, 60, 310, 315, 323, 500, 600, 610, 615, 620, 625, 630, 635, 1100, WF-7011, WF-7015, WF-7511 WF-7515, Pro-WP-4511, Pro-WP-4521, Pro-WP-4530, Pro-WP-4540
Epson: L100, L200, P50, P60, T50, T60, Pro 7000, Pro 9000, Pro 9600
